Fire alarm



Feb. 11, 1930.

FIRE ALARM Filed June 27, 1928 In fuefltof D. HoTcHKlss ,746,4f26V IPatented Feb. 1`1, 1930 UNITED STATES CLARENCE D. Ho'rCHKIss, orGECRCETCWN, CALIFORNIA FIRE ALARM Applicationr med June 27,

The present invention relates to improvements in signalling orindicating devices, and has reference more particularly to a lire alarm.

@ne of the important objects of the present invention is to provide afire alarm that is particularly adapted to be placed near a stove orelectric wires, so that when a re occurs, the 'devices will explode andthus give an audible signal warning of the imminent danger.

A further object is to provide a fire alarm which is simple inconstruction, in expensive, strongand durable, and further well adapt-`ed to the purpose for which it is designed.

Other objects of the invention will become apparent during the course ofthe following detailed description taken in connection with theaccompanying drawing.

In the accompanying drawing, forming a part of this application andwherein like reference characters designate like parts throughout theseveral views:

Figure 1 is a front elevation of the fire alarm embodying my invention,showing the same supported in an attaching bracket.

Figure 2 is a front elevation thereof, and Figure 3 is a longitudinalsectional view through the device per se.

In the drawings, wherein for the purpose of illustration is shown thepreferred em` bodiment of my invention, the numeral 1 designates acylindrical shell that is preferably constructed of brass, the samebeingclosed at its inner end, while the open outer end of the shell iscut to provide the bendable strip 2 as clearly illustrated in Figures 2and 3. The innerclosed end of the shell is slightly enlarged to providea rim portion 3 and arranged wit-hin this rim portion is the precussionelement 4.

The shell is partially lled with an explosive powder 5. The wad of anysuitable material and denoted by the reference character 6 is arrangedwithin the shell to maintain the explosive powder in a packed manner inthe inner end portion of the shell, and` a wooden block .7 is placed inthe forward or outer end of the shell against `the wad 6, after whichthe bendable arms or strips 2 192s; serial No. 288,696.

are directed inwardly against the front face of the block 7 as indicatedin Figure 3. The adjacent strips are thensoldered together, as at 8,thus providing a closure for the forward end of the shelland furthermorecausing the cartridge to explode from the side rather than from theforward end when the explosive powder is ignited. f

The firealarm cartridge is adapted to be supported in close proximity tothe stove or electric wires, by means of a suitable bracket 9 that isformed with an opening to accommodate the shell 1, and the rim portion 3of the shell will be disposed against the rear face of the bracket andthis bracket is adapted tobe secured to the stove pipe or any othersupport by any appropriate fastening means shown at l0.

The use of an alarm of the above mentioned character is thought to bereadily obvious to those skilled in the art to which the present`invention relates and when a fire breaksout, the cartridge will beexploded, thus giving an audible signal and warning the occupant-s ofthe house of their imminent danger While I have shown the preferredembodiment of my invention, it is to be understood that various changesin the size, shape and arrangement of parts may be resorted to, withoutdeparting from the spirit of the invention and the scope of the appendedclaims.

I claim; y

1. `In a fire alarm signal, a cartridge comprising a shell open at itsouter end and adapted to contain an explosive mixture, a packing in theouter end of the shell for the explosive mixture, the outer end of theshell being sealed to effect the side explosion of the cartridge.`

2. In a fire alarm signal, a cartridge comprising a shell open at itsouter en'd and adapted to contain an explosive mixture, a packing in theouter end of the shell for the explosive mixture, the outer end of theshell being sealed to effect the side explosion of the cartridge, andattaching bracket for the cartridge.

3. In a fire alarm signal, a cartridge come prising a. shell open at itsouter end and ada ted to contain an explosive mixture, a pac ing in theouter end of the shell for the explosive mixture, bendable strips at theopen outer end of the shell adapted to be disposed inwardly across thepacking, said strips being solderedtogetherto seal the outerV end of theshell and'cause sidefiringofthe cartridge.

4. In a fire alarmsignal, a cartridge comprising a shell open at itsouter end and ada ted to contain an explosive mixture, a packing intheouter end of the shell for the explosive mixture, bendable strips at theopen outer end of the shell adapted to be disposedginwardly across thepacking, said strips ,beingsoldered together. to seal the outer` end ofYthe shellY and, cause side firing ofxheicartrdge, thefclosedinnerendzof the shell being formed with a rim portion, and anattachingbracket disposed over said shell and engaging with said rim portion.

In testimony whereof Iali-X my signature.

, CLARENCE D.- HOTCHKISS.

